Patent GB-482390-A (GB)
Title: Improvements in and relating to the machining of the sides of ingots and similar work pieces
IPC: B23D1/00
Filed: 1936-11-27
Abstract: 482,390. Grinding ingots &c. TRIGGS, W. W. (Maschinenfabriks-Akt.-Ges. N. Heid) Nov. 27, 1936, No. 32588. [A Specification was laid open to inspection under Sect. 91 of the Acts, June 22, 1937.] [Class 60] [Also in Group XXII] In a machine for planing or grinding ingots or similar work-pieces, the work is mounted on an inclined axis so that the part of the surface coacting with the tool is horizontal. In the duplex form, Fig. 7, the reciprocating table 1 supports a plate 2 which may be tilted around an axis 2a so as to bring one of the generators of the workpieces W in to a horizontal position. The work-pieces are mounted between a headstock 4 and adjustable tailstock 3 while the tools- 47 are mounted in vertical slides. For circumferential feed of the work a motor 5 drives an electromagnetic coupling 6 connected by bevel gears 6a to a control drum 8 and shaft 7. This shaft operates cam mechanism 14, Fig. 13, to impart intermittent feed movement to a ratchet wheel shaft 17b, the feed being regulated by a plunger 17a engaging a driven control cam 17 to vary the stroke of the ratchet lever. The movement of the ratchet wheel shaft is transmitted through gears 15b, shaft 19, shaft 50, Fig. 12, clutches 52 and wormgearing 20 to the work headstocks. Clutches 22 are provided in the work drive so that the intermittent rotary feed may be disconnected and the work-pieces driven directly from a motor 21 for centring. The work-pieces may also be rotated from hand-wheels 53 when the clutches 52 are positioned to disengage the automatic feed. The vertical control of the tool slides is effected from a motor 23, Fig. 10, electromagnetic clutch 24, control drum 26, and shaft 25. This shaft carries cams operating ratchet wheels associated with return-controlling cams similar to that described above. The ratchet wheel shaft 32c is connected through shafts 34, 35, to the feed screws of the tool slides. The electromagnetic clutches are so arranged that the shafts 7 and 25 execute one revolution at each reversal of the table. The tool heads 47 carry a number of tools which are brought successively into position, successive tools being arranged to cut in opposite directions. Where the surface generators have not a constant inclination to the work axis, the work is fed by a tilting motion round the axis 2a. For this purpose the shaft 7 drives a pair of cams 9, one for upward and one for downward motion. These cams actuate stroke-controlled ratchet mechanisms on a shaft 11a, Fig. 11, connected by a cross-shaft 12 to screw and nut gearing for effecting angular displacement of the table. For work-pieces having straight generators the movements of the shaft 12 are effected at the ends of the stroke of the table simultaneously with the rotational feed. For ingots with broken generators, Fig. 7b, the parts I and II are cut in separate operations, the control dogs 57, 58, being arranged at different positions as shown. If the generator is curved the device of Fig. 10a is used. In this case the motor 70 drives in opposite directions a pair of electromagnetic coupling members 71, 72, coacting with an armature 73 to impart reverse drive to the tool a shaft 76 connected to the tool support. A roller 79 engages a templet 78 to operate switch mechanism 83 to determine the direction of movement. The tools may be arranged to have a lateral feed so that ordinary flat work-pieces may be planed. For setting up the work-pieces, they may be supported on a pair of rollers 64, 65 carried by members 62, 63 which may be moved towards or away from each other by a right-and-left-hand spindle 61 rotated by a hand-wheel 68. The two supports may also be moved together in the same direction by a hand-wheel 67. The planing tools may also be of the form shown in Fig. 6, or milling cutters or grinding discs may be used.